Snow levels fell in both cases despite lack of cold advection (weak low-level warm advection in both cases).
Primary low to mid-level isentropic lift was forecast just south of the area of interest in both cases.
Snow levels fell despite a lack of low-level upward vertical motion.
In both cases the RUC appeared to do a better job in showing the deep isothermal zero degree layer.
Neither model showed much mid-level cooling during falling snow-levels.
In both cases, temperatures fell to near or just above freezing, but did not fall below freezing.
Both systems were associated with deep upper lows / cold air aloft.
Both systems were associated with closed lows at 700 mb and strong mid-level frontogenesis.